Oven without dust rise

ABSTRACT

An oven has an enclosed heat exchange zone for use with biomass fuel. The oven has a body which is able to be placed on the ground. The body has a combustion cabinet and an auxiliary equipment cabinet. The combustion cabinet has a burner received therein. The burner has a fire grate, a side plate, a blowing space, and a hearth. A heat exchange zone is defined by the surrounding tubular inner wall; a side heating zone being defined by a tubular inner and a tubular outer walls. A chimney is formed on the tubular outer wall in communication with an upper portion of the side heating zone. An opening is defined in the top of the combustion cabinet right above the tibular inner wall.

The invention relates to an oven for use with biomass fuel, and more particularly, to an oven using granule made by smashed and then briquetted straw, bits of wood, or crop stalks and having no rise of dust from an oven-top thereof.

DESCRIPTION OF RELATED ART

Biomass fuel is granule made by smashed and then briquetted straw, bits of wood, or crop stalks. As a new energy solution, biomass fuel has wider and wider been used because it is hygienic, environmental, high efficient, and economic.

A conventional biomass oven is disclosed in a PCT application PCT/CN2011/080668 “An Oven Having Enclosed Heat Exchange Zone”. As shown in FIG. 4, the oven has a body 9 which is able to be placed on the ground. The body 9 has a combustion cabinet 91 and an auxiliary equipment cabinet 92. The combustion cabinet 91 has a burner 93 received therein. An air supply zone 94 is defined below the burner 93 and a burning zone 95 is defined above the burner 93. A heating zone 96 is beyond the burner 93. Heat exchanges mainly in the heating zone 96. An oven-top 97 is defined in a top of the combustion cabinet 97. A pot (not shown) may be placed on the oven-top 97.

The main drawback of this traditional oven is dust rise. When a user takes the pot off the oven-top 97, ash in the burning and the heating zones 95, 96 will fly out from the oven-top 97, which may pollute surrounding ambient and food being heated.

BRIEF SUMMARY OF THE INVENTION

The main object of the invention is to provide an oven without dust rise. It is not easy for ash in a burning and a heating zones of the oven to fly out when a pot on an oven-top is taken off.

In order to accomplish the above objects, the present invention provides an oven without dust rise. The oven uses biomass fuel and has a body which is able to be placed on the ground. The body has a combustion cabinet and an auxiliary equipment cabinet. The combustion cabinet has a bottom which is able to be levelly placed on the ground, a side extending upward from a peripheral of the bottom, and a top in connection with an upper peripheral of the side and opposite to the bottom. An oven-top is defined in the top. The combustion cabinet has a burner received therein. The burner has a fire grate, an air supply zone being defined beneath the fire grate and burning zone being defined above the fire grate. A plurality of vent-holes is defined in the fire grate. The auxiliary equipment cabinet has a fuel supply mechanism and an electrical equipment received therein. The fuel supply mechanism has a hopper, a fuel tube having one end in communication with said hopper and a free end extending into said burning zone, and a rotary vane feeder rotatably received in said fuel tube. The electrical equipment has a suction fan, a feeding motor for driving said rotary vane feeder, an air blower for supplying air to said air supply zone, a power supply, a switch, and a power light. A dust removing device is between the burner and the oven-top. The dust removing device has a cylindrical inner wall and a cylindrical outer wall between which an ventilation zone is defined. A circular slit is defined between the cylindrical inner wall and the cylindrical outer wall near the oven-top. A ventilating duct connects the ventilation zone with a suction fan.

The oven without dust rise of the invention has following beneficial effect. When the user takes a pot off a burning oven, gas going out from the burning zone goes into the ventilation zone through the circular slit under pressure from the suction fan and exhausts via the ventilating duct. Dust contained in the gas flows slower and may drop into a dust collect zone. The dust will no longer fly out of an oven-top driven by an air blower. Pollution to surrounding ambient and food being heated is able to be reduced.

These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a schematic perspective view of the preferred embodiment of the oven of the invention.

FIG. 2 is a cross-sectional schematic view of the oven shown in FIG. 1.

FIG. 3 is a circuit diagram of an electrical equipment of the oven shown in FIG. 1.

FIG. 4 is a cross-sectional view of a conventional biomass fuel oven. And,

FIG. 5 is an exploded perspective view of another embodiment of the oven of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Shown in FIG. 1 is the preferred embodiment of the invention, an oven without dust rise. The oven has a body 1 which is able to be placed on the ground. The body 1 has a combustion cabinet 10 and an auxiliary equipment cabinet 20.

With reference to FIGS. 2 and 3, the combustion cabinet 10 has a bottom 11 which is able to be levelly placed on the ground, a side 12 extending upward from a peripheral of the bottom 11, and a top 13 in connection with an upper peripheral of the side 12 and opposite to the bottom 11. An oven-top 131 is defined in the top 13. A door 121 is provided in the side 12.

The combustion cabinet 10 has a burner 30 received therein. The burner 30 has a fire grate 31. An air supply zone 33 is defined beneath the fire grate 31 and burning zone 34 is defined above the fire grate 31. A plurality of vent-holes 311 are defined in the fire grate 31.

A dust removing device 40 is provided between the burner 30 and the oven-top 131. The dust removing device 40 has a cylindrical inner wall 41 and a cylindrical outer wall 42 between which an ventilation zone 43 is defined. A circular slit 44 is defined between the cylindrical inner wall 41 and the cylindrical outer wall 42 near the oven-top 131. The ventilation zone 43 is in communication with a suction fan 61 via a ventilating duct 45. A pot (not shown) is able to be placed on the oven-top 131.

The auxiliary equipment cabinet 20 has a fuel supply mechanism 50 and an electrical equipment 60 received therein. The fuel supply mechanism 50 has a hopper 51, a fuel tube 52 having one end in communication with a bottom outlet of the hopper 51 and a free end extending into the burning zone 34, and a rotary vane feeder 53 rotatably received in the fuel tube 52. The electrical equipment 60, as shown in FIG. 3, has the suction fan 61, a feeding motor 62 for driving the rotary vane feeder 53, an air blower 63 for supplying air to the air supply zone 33, a power supply 64, a switch 65 and a power light 66. The power supply 64 may be an independent alternating current/direct current power supply 641, having or having not a storage battery 642 in parallel as auxiliary. Either the alternating current/direct current power supply 641 or the storage battery 642 is able to supply power independently. The switch 65 is installed on the auxiliary equipment cabinet 20 and able to control the power supply of whole circuit. The power light 66 is also installed on the auxiliary equipment cabinet 20 near the switch 65 and used to indict status of power supply.

Fuel 70 is biomass fuel granule made by smashed and then briquetted straw, bits of wood, or crop stalks.

In use, a user is able to first stably place the body 1 of the oven on the ground where there is desirable and then load fuel 70 into the hopper 51. The user is able to put either water or food into the pot and then place the pot on the oven-top 131 of the top 13. The user is able to load some fuel in the burner 30 in advance and ignite the fuel with a linen alcohol cotton ball. When the user turns on the switch 65, the power light 66 turns up, indicating that the electrical circuit is closed and the oven starts to work. The feeding motor 62 starts to rotate, driving the rotary vane feeder 53 to send the fuel 70 into the burner 30. Biomass fuel granule falls onto the fire grate 31 under the gravity and starts to burn continuously. At this time, the air blower 63 starts to supply air to the air supply zone 33. Air enters the burning zone 34 through the vent-holes 311 in the fire grate 31 and provides oxygen for combustion of the fuel 70. Methane gas is generated in a process of burning of the fuel 70. With air flow produced by the air blower 63, the methane gas burns into flames. Also at the same time, the suction fan 61 starts to work. Gas in the burning zone 34 enters the ventilation zone 43 through the circular slit 44 under a suction of the suction fan 61, and exhausts through the ventilating duct 45 thereafter. The arrows in the circular slit 44, ventilation zone 43 and the ventilating duct 45 in FIG. 2 show a flowing direction of the gas.

Shown in FIG. 5 is an exploded perspective view of another embodiment of the invention. This embodiment is basically the same as the above preferred embodiment, except that a dust removing tank 46 is provided in the combustion cabinet 10 beside the burner 30. The dust removing tank 46 is in communication with the ventilating duct 45 and has filter water 47 therein, a middle wall 461 sticking out water level, a first side wall 462 under the water level on one side of the middle wall 461, and a second side wall 463 under the water level on the other side of the middle wall 461. A side of the dust removing tank 46 of the first wall 462 side is in communication with the ventilating duct 45 of the oven-top 131 side, and the other side of the dust removing tank 46 of the second wall 463 side is in communication with the ventilating duct 45 of the suction fan 61 side. The arrows in the dust removing tank 46 shown in FIG. 5 show a flowing direction of gas. In use, gas goes through the circular slit 44 and the ventilating duct 45 to the side of the dust removing tank 46 of the firs wall 462 side and enters into the filter water 47 here. The gas goes out of the filter water 46 between the first side wall 462 and the middle wall 461. The gas will re-enters the filter water 47 between the middle wall 461 and the second side wall 463 under a negative pressure produced by the suction fan 61. The gas goes out of the filter water again at the side of the dust removing tank 46 of the second wall 463 side and finally enters the ventilating duct 45 of the suction fan 61 side. After passing through the filter water 47 in the dust removing tank 46, dust in the gas is left in the water and dust rise will be able to be further reduced.

From above description, it is seen that the objects of the present invention have been fully and effectively accomplished. Embodiment of the invention has been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from the invention's principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims. 

1. An oven without dust rise using biomass fuel comprising: a body which is able to be placed on the ground, said body having a combustion cabinet and an auxiliary equipment cabinet, said combustion cabinet having a bottom which is able to be levelly placed on the ground, a side extending upward from a peripheral of said bottom, and a top in connection with an upper peripheral of said side and opposite to said bottom, an oven-top being defined in said top, said combustion cabinet having a burner received therein, said burner having a fire grate, an air supply zone being defined beneath said fire grate and burning zone being defined above said fire grate, a plurality of vent-holes being defined in said fire grate, said auxiliary equipment cabinet having a fuel supply mechanism and an electrical equipment received therein, said fuel supply mechanism having a hopper, a fuel tube having one end in communication with said hopper and a free end extending into said burning zone, and a rotary vane feeder rotatably received in said fuel tube, said electrical equipment having a suction fan, a feeding motor for driving said rotary vane feeder, an air blower for supplying air to said air supply zone, a power supply, a switch, and a power light, a dust removing device between said burner and said oven-top, said dust removing device having a cylindrical inner wall and a cylindrical outer wall between which an ventilation zone is defined, a circular slit being defined between said cylindrical inner wall and said cylindrical outer wall near said oven-top, a ventilating duct connecting said ventilation zone with a suction fan.
 2. The oven without dust rise as claimed in claim 1, wherein a dust removing tank is provided in said combustion cabinet beside said burner, said dust removing tank being in communication with said ventilating duct and having filter water therein, a middle wall sticking out water level, a first side wall under said water level on one side of said middle wall, and a second side wall under said water level on the other side of said middle wall, a side of said dust removing tank of said first wall side being in communication with said ventilating duct of said oven-top side, and the other side of said dust removing tank of said second wall side being in communication with said ventilating duct of said suction fan side. 